A sandwich that contains all aspects of a large dinner.
For instance: With a roast/Sunday dinner, one may put mashed potato, carrots, roast potato, chicken (or whatever meat you have) and possibly a Yorkshire pudding.
The kinds of Grandwiches are endless.
Bill: Man, I just chowed down on the most epic Grandwich!
Bob: ... Grandwich?
Bill: Yeah! The sandwich of all aspects; The Grandwich! It is legion, it does not forgive, it does not forget. Expect it.
When one observes a predatory male touching feeling and generally harassing other females who are oblivious to said males activities.
Person 1: Do you wanna play the Greg game??
Person 2: Yeah go on, look at that fucker over there.
Person 1: Mate is he playing rock paper scissors and touching their thigh's, cheeky cunt!
Person 2: Fuck me, he's even getting away with it?!
n. Slang, A synonym for an american express card used for corporate purchases. Derives its name from the green color of the credit card typical of american express corporate cards.